在数组中，使用PHP根据键值对项进行分组

<?php
$array = array(
    array('name' => 'Alice', 'age' => 20),
    array('name' => 'Bob', 'age' => 25),
    array('name' => 'Charlie', 'age' => 30),
    array('name' => 'Alice', 'age' => 35)
);

$result = array_reduce($array, function($carry, $item) {
    $name = $item['name'];
    if (!isset($carry[$name])) {
        $carry[$name] = array();
    }
    $carry[$name][] = $item;
    return $carry;
}, array());

print_r($result);
?>

Array
(
    [Alice] => Array
        (
            [0] => Array
                (
                    [name] => Alice
                    [age] => 20
                )

            [1] => Array
                (
                    [name] => Alice
                    [age] => 35
                )

        )

    [Bob] => Array
        (
            [0] => Array
                (
                    [name] => Bob
                    [age] => 25
                )

        )

    [Charlie] => Array
        (
            [0] => Array
                (
                    [name] => Charlie
                    [age] => 30
                )

        )

)